RE: [avr-gcc-list] Strings in ROM

[Weddington, Eric]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Robert von Knobloch
> Sent: Friday, March 13, 2009 6:51 AM
> To: address@hidden
> Subject: [avr-gcc-list] Strings in ROM
> 
> #define SECTION TEST1_SECTION
> 
> SECTION prog_char press_button[]    = ">>  Press UUT button  <<";
> SECTION prog_char button_timeout[]  = "*** Error - Timeout! ***";
> 
> where the linker sees:
> LDFLAGS       = -Wl,-Map,$(PRG).map \
>         -Wl,--section-start=.test0=0x2600 \
>         -Wl,--section-start=.testparms0=0x2e80 \
>         -Wl,--section-start=.test1=0x2f00 \
>         -Wl,--section-start=.testparms1=0x3780
> 
> 'make' results in:
> 
> avr-gcc -g -Wall -Os -mmcu=atmega644 -DF_CPU=20000000      -c 
> -o main.o
> main.c
> In file included from main.c:25:
> tests.c:138: error: section of 'press_button' conflicts with previous
> declaration
> tests.c:139: error: section of 'button_timeout' conflicts 
> with previous
> declaration
> 
> I cannot find where 'prog_char is defined and would like to know how I
> can force the compiler to put these strings in my 'test1' section.

prog_char is defined in <avr/pgmspace.h>.

Take a look at the GCC user manual, under Function Attributes, look at the 
"section" attribute:
<http://gcc.gnu.org/onlinedocs/gcc-4.3.3/gcc/Function-Attributes.html#Function-Attributes>